Bunk bed frame



FIG. 1 is a perspective view of a bunk bed frame, showing my new design;

FIG. 2 is a side elevation view thereof with the view from the opposite side being substantially the same;

FIG. 3 is an end elevation view thereof with the view from the opposite end being substantially the same;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a bunk bed frame, as shown and described. 